Thank you for your response.
My understanding from reading the IRS documentation is that I was no longer eligible to contribute to the HSA once I was covered by Medicare part A.
The Medicare part A coverage started on April 1 2022. I expected that my April HSA contribution and my May HSA contribution were not allowed. The total for these two months is the $600.
I also thought that I could correct this mistake prior to filing my taxes.
BTW these were made by my employer through payroll detection, if that matters.
